I think, by the wide range we can digest, humans are scavengers. Pretty gross on the whole.
But having higher reasoning, we can choose our diets for optimum health and ethics. I don't want to put BGH in my body. I know it's terrible for me. Lots of milk from another animal? Probably not good for me. I don't want to support the slaughter house industry.
Having B12 problems in the past and feeling better with minimal animal sources in my diet, I'll continue to consume a little, but you research and make the choices best for you, and so long as you're healthy, ignore the naysayers.
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